Grinding apparatus



March 30 1926.

J. T. MOLTRUP GRINDING APPARATUS Filed June 5, 1924 7 Sheets-$heet 1' INVENTOR Mirch 30 1926. 1,578,342

.1. T. MOLTRUP GRINDING APPARATUS Filed June 5, f1924 7 Sheets-Sheet 2 INVE N'i'oR J. "r. MOLTRUP GRINDING APPARATUS Filed June 5, 1924 March "30 1926.

7 Sheets-Sheet 5 P s c c a ll} mvsu'roa HUHHHHW fln u 4 QN T .I: 1 hm. Q G mw 8 k 3 March 30 1926.

. .J. T. MCLTRUP GRINDING APPARATUS Filed June 5, 1924 7 Sheets-Sheet 4 March 30 1926.

V J. T. MOLTRUP GRINDING APPARATUS Filed June 5, 192

7 sheets-sheet s J. T. MOLTRUP GRINDING APPARATUS March 30 1926.

Filed June 5, 1924 v Sheets-Sheet e w 0 mu r f I 1x1 IILI \lrl I141 HII Ilvl II 0 iii n a. a

IINVENTOR I Ill! March 30 1926. 1,578,342

J. T. MOLTRUP GRINDING APPARATUS Filed June 5. 1924 7 sheetsvsheet 7 YINVENTOR Q ing the grinding wheel arelativelysmall To all whom it may concern Patented Mar. 30, 1926.

NI -QED STA E f FAT NT; OFFICE;

'itj uomnug or' BEAVER-FALLS, PENNSYLVAIFIA.

oamniivo APPARATUS.

Application 'filed thine 5,

Be it known that I, J. MES a citizen of the United States, residing at Beaver Falls,Beaver County, Pennsylvania, have invented a new and useful Improvef ment inGrinding Apparatus, of which the following is a full, clear, and exact descrip-, tion. V

apparatus of the'type in which'the workis supported on aflstationary table and the grinding wheel is given a combined rotary and reciprocating motion,';th e reciprocating motion being in a direction at rightangles to the axis of the wheel-and serving to traw erse the latteriback and forth over the work.

I have found that in the grinding of certain kinds'of work, such as engravingplat'es, it is practically impossible to grind a level surface at a reasonable cost unless poinparatively soft, broad-faced grinding wheel,

is employed and the latter givenlan axial reciprocation simultaneously withthe aforesaid combined motion. 'Preferably, the axial stroke should be equal in extent to only a fraction of the width of the 'wheeh; j

The purposewof the present invention, therefore, is toprovide a grinding apparatus of the above type embodying means for jgivaxial reciprocation simultaneously withgits' combined rotary and traversing motion} The invention embodies in addition various improved constructional features-which will be hereinafter fullydescribed and covered in the claims. m p

. A preferred embodiment of the invention is illustrated in the accompanying drawings, in which a y r Figures 1 1 and 1' illustrate, -,-respective1y,in plan, the left-hand portion, the central portion and the right-hand portion of the grinding apparatus; 5

Figures 2 2 and 2 are views correspondingto Figures 1 and 1 but showing the grinding apparatus inside elevation; I

Figure 3 apparatus;

Figure 4 is a vertical transverse sectional. view on the line IVIV of Figure 2 and vFigure 5 is a horizontal sectional-view on the line VV of Figure 4. a i j In the illustrativeembodiment of the in.- vention, 2 designates a work table having.

is an end view of the grinding a horizontal upper surface 'forsupporting thework. This work table is providedon its T. Monrnur, e.

The present invention relates to grinding] 1924fseria1ro. 718,047. U

under side with taperingribs3 and whose lower mchned edges engage the correspond- 6 on a basecastin'g 7 It will be seen ingly inclined upper edges: of ribs 5 :and- Y j interlocking engagement withxthe ribs 5,

thereby preventing any lateral movement of,

the table with respect-to the base 7.

I The base 7 is'supported 'adjacent to and" intennediateits ends -upon three transversely e extending pedestals 8, 9 and; 10, said base;,fl

being secured to said pedestals by bolts-1 11] The pedestal 8 forms anintegralpart of an a auxiliary casting 12 which supports -an elec-. tric'motor 13 and means driventherebyyfor reciprocating the main grinder carria'ge, as

will be described in detail hereinafter.

The base 7 hasja horizontal ledge 1 at each side thereof 'and seated, upon each of hardened steel; Each of these trackmembers has an inverted Vashaped upper edge of these ledgesis a track member 15 formedfor reciprocation longitudinally of the work table on the tracks 15. This'carriage has dependingv therefrom adjacent the opposite ends thereof housin gs 19, in which are jour-v naled rollers-20'which travel'on the tracks,

15-, these rollers having Vshaped"peripheral groovesin' which theupper edges-of the.

tracksengage. In order to prevent gritfrom a getting-between the wheels-2Q and the tracks 15, wipers 117 are bolted to the ends of the wheel housin gs 19. i

' Journaledin, brackets'Ql and 252, bolted tofandprojectingffrom the opposite ends of the base 7, is a pair of shafts 23 and 24. These shafts have sheaves '25 mounted on their opposite ends. Engaging these sheaves) is a; pair ofecablesf26. Each cable'hasits I ends secured to eye'bolt s 27. mounted in brackets 28 bolted. to the carriage 18. ,The shaft 24 is adapted to be, driven in e ther direction by the motor 13 through a'trainfi of gearing'29," worm shafts. 30 and 31 and, v

worm wheels 32 a'nd33. The worm shafts] 30-and 31 are journaled in bearings 34 and gearhousings 35bolted toHthe base-IQ the shaft 24. being also journaled in thegear I -housings 35. The gear wheels 32 and 33 are loosez'on the shaft 24 and have associated therewith clutch members 36 and 37. Keyed, s

to the shaft 24 for slidingmovementj'between the clutchgmembers 36 and 37 is a clutch 'sl'eeve'38- having-clutch members andl h) formed onits opposite ends for'co together.

operation with theclutch members 36and 37. A clutchlever elhav ng oneendnn; operative engagement with the clutch sleeve 38 is pivoted at 522 ton. spreader which is secured at its opposite ends tolugs 44 proextends longitudinally er the base Ta-tone side thereof Band isisirpported for sliding 'niovementinbrackets {l9 secured to the base. The rod 48" has secured thereto adjacent the op'positele-nds or the work tabl e 2 'de- .7 pending dogs 50 andg5l. carriage18"hasn1ounted therein at the end The main grinder adjacent therod 48a pair of; plunge-rs 52 and; These plnngers are 7 sli-dahly mounted in housings 54 and have stems,

surrounded. by cell springs 56-wliic1r urge the pl'ungers outwardly. Outward move;

ment of the plungers islimited by nuts 57 on the ends "of these stems. I jPivota ll-y con- I one of the bearings 21.

' nected 1w the rigl ixt-hand end of the rod 48- ("Figure' 2) is-an operating handle 58, the lower end" of thishandle being pivotall' yf connected to a bracket '59 projecting from It will be apparent that sleeve 38 will lee-shifted ina directiontoengage the clutch'member 39 with thecl'uteh member 36,.and that by moving the handle 58 tothe right, the sleeve 38 will be moved in the opposite direction to bring-- thecl'utch member 420 into" engagement with the clutch q member 3.7. Assuming the clutch sleeve 38 to be inthe neutral position shown in F'i-g- 7 other.

ure 16, the motor 13 is ineffective t-o lnovethe carriage 18 in either di-rectionybut by moving the handle 58in one direction or the other, the motor 13 can be operatively connected to: the shaft 24 to cause movement ot' the grinder carriage in one direction or the Afterthecarriage has been put in operation in-this manner, the clutch sleeve 38" will be automatically actuated to cause the carriage to al'tern'ately niove in one direction longitudinally of the Work table "and'theninth'e'opposi-te direction-by the co-operation of the plungers 52 and with the dogs andl51.

It the carriage is movto the left, Whentheplunger strikesthe'dFog 50, the plunger will be moved in.- wardlyytherehy placing its spring 56' undercompression. As soon as suflicient energy has-been stored up in the spring in this manner, it will suddenlythrust the plunger- 52 outwardly and" thereby shift the clutch sleeve '38 a direction to ch'sengage the by 1 moving the V handle 58 to the le-ftt Figure 2?-)'-"theclutch" held on the ste-nrby a nut; 81.

end of the plunger 77 carries a-rol'l'e'r clutch member 4-0. from; the clutch member 7 '37 and move the clutch-"member 39 into engagement with the clutch member 86;. I

This will cause t 'he iinnnediate reversal of the direction of movement of the carnage,

causing ittto move to the right until the plunger"53' strikes the dog 51, whereupon the clutch sleeve 38 will be shifted in thej opposite direction and the movement ofthe carriage again reversed; 'j The rod; 148 can be lockedwith the clutch sleeve 385i neutral positionby means oiia'leveifl 6O. p1v'oted on the rod adjacent the right-hand endithereof' and adapted to be "turnedintoaposition toengage between collars 631 and GQ-mounted on the end of a ro'd 63 mounted in' the brackets 49. I

' ,Bolted to opposite sides ohthe 'main grinder carriage 18 is a pair of hardened steel track member-96dsim lar tothetrack An aux liary grinder carriage members 15'.

65Qis mounted "for reciprocation. on thesetrack "member'stransversely of" the work table. This auxiliary carriage, carries Wheels 66, similar to; the {\v-heels20, tor

engagement 'with the track "members 6%.' Journaled in'the carriage -18 adjacent opposite ends thereof s a pairof l1ori7-on tal sheaves 6 and 683 -A eahle69 engages these sheaves and is fastened to-- a-bracket 70' carried, by the auxiliary grinder carriage G5. shaft 71 which carries a bevel pinion meshing with: a bevel pinion 73fcarrled by a horizontal shaft' 74.} The shaft 7% has IHQHIIlZBGl OH the outer endthereoita hand The sheave 68' is-m-ounted ona vertical wheel, 75:. f It will be apparent; that; by

turning this-jghand Wheel, the auxiliary on riagecan he-shifted in either 7 direction transversely o-t'the worktable. 'Proaectmg froln the right-hand end of the auxiliarycarriage igures l"'and 2 i) sis albracket 76 in. which is" sli-d 'ahly mounted; a plunger 77 having a stem 18' pro ectingab bracket and'eurrounded by a coil s y g; I the upper end of which engages washer 80. T he lower whicl-r engages. aflange 83 'extending'l'ongitud -inally of the niaincarrlage 18, whereby the auxiliary carriage" 1s yieldingly' held against tendency to tilt-upwardly Withrrespect to. the main carriage;

The auxiliary carriage 65' carries-the grindingwheel 84- and-the :means "for imartin rotation and axial' rec-i n'ocation thereto. The wheel84 is mounted upon a shaft. 85 keyed to but" sl-idably' mounted withinan inner sleeve 86. The inner sleeve i '86- is jrournaled' upon ball bearings SZ' Within a housing 88. -Mounted upon the shaft adjacent one'end of the housing 818 is a pulley 89 which is driven through a' belt' '90 by a motor '91 having a drive pulley 92 mounted uponits armature shaft and en gaged by the belt 90. Journaled upon the end of the shaft 85 adjacent the pulley 89: I V v p s hand wheel 97. When tlieplate has been is a head 98 having a bifurcated extension 94 at one end thereof. The housing88 is carried by a frame 95 adjustable vertically in the auxiliary carriage by means ofa screw 96 operated byahand wheel 91'. Bolted to one end of the frame 95 and ;le'-.

pending therefromds a pair of spaced brackets 98 in which is journaled a shaft- This shaft has a crank p1nX100 our-" rod having its oth r end positioned between the bifurcations 9 1 and journaled upon a pin 102 fixed therein. Mounted upon one end of the shaft 99 is a pulley 103 whichis driven by a motor 104- through a belt 105, the motor 104 being mounted upon the frame 95. The motor 10 "is adapted, through the connections describechto impart an axial reciprocation to thegrinding' wheel 84. Theextent of this reciprocating motion will preferably be-only a fraction the width of the grinding wheel. rlssuming the width of the grinding wheel to be 6,

the axial movement thereof may be to 1. The upper portion of the grmding wheel 1s surrounded by a casing 118.

In order toprevent any dust or grit from entering the bearings of the shaft 85, the

latter has a collar 106 mounted thereon at one side of the grinding wheel, said collar having: an annular groove 107; therein in which an annularflange 108 on a ring: 109 engages. This ring is bolted to one end of the housing 88. Bolted to the opposite end of the housing 1s a rlng 110 having an an-. nular flange 111 engaglng -ln an annular groove 112 in 'the pulley 89.11; willbe seen that this construction permits the shaft to have a slight reciprocatingmovement without the flanges 108 and 111 leaving the grooves 107 and 112. The bearings 87 are,

therefore, completelyprotected at all times against the entry thereinto of dirt or grit.

As has already been explained, the frame can be raised or lowered by turning the hand wheel 97, thereby raising or lowering the grinding wheel 84;. The work table 2 is adapted to be adjusted vertically by moving it longitudinally of the base 7. This longitudinal adjustment of the work. table is made by means of 'a hand wheel'113 mounted on a shaft, 114. The shaft ll l is journaled in a bracket 115 mounted on the base 7 and has a screw-threaded end portion engaging a nut 116 bolted to the work table.

\Vhile the operation of the apparatus may be readily understood from the foregoing description, it may be briefly summarized as follows: Assuming the" main'grinder carriage 18 to beat rest and the levergfiO'in V the'position shown inFigure 1,the plate or the like to be ground may be placed upon the workvtable 2, the grinding wheel having -1irstbeenv raised by Y turning the properly positioned, thehand wheel 97 will i be turned to lower the grinding wheel 842 and the-handle 58 moved in a direction to throw one ofthe clutch members 39 or 10' intoengagement with '1 its co-operat-ing clutch member 3601' 37, thereby operatively connecting the motor 13 to the shaft 241 and setting the main carriage18'i-n motion; The carriage will thereafter be automatically moved back and; forth longitudinally of the work table, thereby carrying the" grinding ,wheel8t from' one end ofthe plate to be ground to the other. At the same. time, the

motor 91 will be imparting [rotation to the grindingwheel 8 1 and the motor 10 1 will be iinp'artingaxial: reciprocation thereto, means of the' hand wheel75, the auxiliary carriage 65' can be shifted from time to time 1 transversely of the work table so as to effect the grinding'of the entire surface of the workh- By manipulating the hand wheel 11'3,the operator can shift the work table 2 longitudinally of the base 7 to elevate the plate being ground in order to obtain at all timesthedesired pressure of the grindmg wheelagainstthe work. "The roller 82 engaging the flange 88' prevents the auXiliary carriage from. being lifted out of engagement Wltllttllfl right-hand trackedwhen the worlrtable is elevated in this -manner. 1

"While I have shown and described a preferred embodiment of my invention, it will be understoodthat changes may be made in departing from the spirit of the invention or scope of the appended claims.

Iclaimfl s 1. Grindingapparatus,comprising a work table, tracks at opposite sides of said table 1 extending longitudinally thereof, a carriage having wheels engaging said tracks, agrindthe details of construction shown without ing wheel mounted on said carriage with its axis extending at right angles to the direction of movementthe'reof, means for reciprocatingsaid carriage to move said wheel back and forth over said table, anda pair-of elec-' trio motors mounted'on said carriage for ro-, tat'ing said wheel andim'parting axial reciprocation thereto, substantially as described. 2. Grinding apparatus, comprising awork w table, tracks at opposite sides of saidtable extendlng longltudlnally thereof, a-carriage' havin wheels en a in saidtracks housin s 1 having said wheels journaled therein, wipers carried by said carriage and engaging said tracks in advance of thewheels, a grinding wheel m'ounted on said carriagewithits axis extending at right angles to-the direction of movement thereof, means for reciproeating said carriageto move said wheel back and forth over sald table, andrneans for rotat' 7 nsane foradjustingthe lilOSlflQ-H of-thefai V lllal'y carriage transversely of the main ca-rdirection ;o

' ly as described.

ingsaid wheel and imparting axial reciprocation thereto, substantially as ClGSCFllOGQl;

Grinding apparatus, comprising a work table, tracks at opposite sides Of SQLlCl L'QblGV extending longitudinally thereof, a main carriage movable longitudinallyof. said, table and having Wheels engaging c said; traces,

tracksat opposite sides of said; main carriage extending longitudinally thereof, an an-xii iary carriagehavi-ng Wheels engagingsaid last-.mentioned tracks and movable in a die rectionv at right angles tofthe direction of movement of the main carriage, a grinding 'WllGQl mounted on theauxiliary carriage rills-ax s :]1 ri' t-a-"i- 1 WM 7 exte iding t gh ang es to the .moveinent of the main carriage,

means forreciprocating the main Carri-a nally thereof, an auxiliary carriage having; Wheels engaging said tracks and novable in a direction atright angles to the direction of IHOYGlllGllt-bf the main carriage,.a grinding 7 wheel. mounted on the auxiliary carriage with its. axis extending at right angles to the direction ofmovement of the ma n car-' riage, nieans for reciprocating the main car; r-lage, means forad nstmg the posltron of the fluXilHtPy" Ct11l:ig8 transversely of the main carriage, and means mountedfon the au'Xiliary carriage for rotating-said Wheel and imparting axial reciprocation tially as described. i Grinding apparatus, comp-rising a.- Work table, ashaftadjacent each endot f'said table extending transversely thereof, mounted on said shafts adjacent the sides of the table, a carriage movable longitudinally of said table, a cable engaging the pair of sheaves at each side of said table and having itsends attached to said carriage, a motor for driving one of said shafts in either direc tion, a clutch for controlling the direction of rotation ot said shaft, autoni'atlc means for operating said clutch to efiect reciprocation ofsaid carriage, a grinding Wheel mountedi on said carriagewith its axis extending at right angles-to the direction of movement shafts in either direction, a clutch for thereto, substanr qtable, a main carriage movable longitudi" nall'y of said table, an auxiliary Ctl'iilfiQQ.

' sheaves transversely thereof, sheaves nally ofsaid table, a cable engagingthe pair of sheaves'at each side of said table and. having its ends attached. to said carriage, a motor for driving one of said;-

controlling the direction of rotation of said shaft, automatic means for operatingsaid clutch to effect reciprocation of said carriage, a grinding Wheel mounted on said car riage with its axis extending at right angles meansfor rotating said Wheel and imparting axial reciprocation described. V V y I 7. Grinding apparatus, comprisinga base having parallel ribs With inclined upper edges, a Work table having a horizontal up per, surface and having ribs With inclined lower edges, engaging the upper edges of the ribs of said base, meansforadjusting said table longitudinally ofsaid base for effecting: vertical adjustment, of said; table, a carriage movable longitudinally of said table,,a grinding Wheel mounted on'said -cairiage with its axis extending at right angles to the direction of movement of the carriage, means for reciprocating said carriage and mean-sv for rotating said Wheel, substantially described. v I i i S. Grinding apparatus,v comprising a Work table, a carriage movable longitudinally of said table, a g

shaft extending at right angles to the d tion of movement of the carriage and led on ball-bearings Within a housif'igicar- I grit from. entering said. bearings, substair.

tially as described. 1 V v Grinding apparatus, con'lprismga worl r mounted on said main carriage'a-nd movable in a direction at right angles to the direction f to the direction of movement thereof, and

thereto, substantially as riznding Wheel mounted on a;

ried by said carriage, means for reciprocat; .ing' said: carua-aga-aneahs for rotating said, i

of movementof' the n'iaincarria'ge, a "grind- 111g wheelmounte'dona shaft extend ng an angle to the direction of movement of said main carriage and ournaled ma vertical'ly adjustable fraine carried by the auxilia'ry' carriage,'nieans for reciprocating main carriage, and means carried by the auxiliary carriage for rotating said wheehl substantially as described. t

1'0. Grinding apparatus, comprising a work'table, a main carriage movable lon gitudinally of said table, an auxiliary car'- riagemounted on said main carriage and movable in a directionatright angles to the direction of movement of themain carriage,

a'gri nding \vheel mounted-on a shatt extending at an angle tothe direction of-n'iovement of, said main carriage and journaled in a vertically adjustable frame carried by the 211131111313 carriage, means for reciprocating said mam carriage, means carried by the auxiliary carriage for rotating said Wheel, and means carried by said frame for 1mparting axial reciprocatlon to said Wheel,-

substantially as described.

11(Grindin an aratus com risin a' a: l a o Work table, a carriage movable longitudinally of said table, means for reciprocating sald carriage, a bearing on said carriage, a

shaft mounted for rotation and reciprocation support, means mounted on said support for imparting axial reciprocation to said wheel, and means for rotating said Wheel, substantially as described. a

13. Grinding apparatus, comprising a Work table, a carriage movable longitudinally of said Work table, a grinding wheel mounted on said carriage with its axis extending at right angles to the direction movement thereof, means for rotating said Wheel, means for reciprocating said carriage oversaid table, "a clutch for controlling-the.

direction of movement of said carriage,,and automatic means for operatlngsaid clutcl to effect reciprocation of said carriage, comprising a sliding member having a pair of. spaced dogs thereon and spring-pressed plungers mounted on said "carriage for cooperation .Wlth'SiLid. described.

14. Grinding apparatus, Work table, a carriage movable longitudinally of said Work table, a grinding Wheel dogs, substantially as v comprising a mounted on-said carriage with its axis eX tending at right angles to the direction of movement thereof, means for rotating said Wheel, means for reciprocating said carriage over sald table, a clutch'for controlllng thev direction of movement of said carriage,

automatic means for operating said clutch to effect reciprocatlon of said carriage,

comprising a sliding member having a pair of spaced dogs thereon, spring pressed' plun gers mounted on said carriage for coopera-v tion Withsaid dogs, and means for locking J. T. MoLTnUr.

said sliding member "to hold the clutch in 'neutralposition, substantially as described. a In testimony whereof I have hereunto set. my hand. i 

